@article{DAN_1978_241_6_a5,
     author = {P. E. Khmel'nitskii},
     title = {On the asymptotics of the spectrum of integral operators connected with elliptic boundary value problems},
     journal = {Doklady Akademii Nauk},
     pages = {1277--1280},
     publisher = {mathdoc},
     volume = {241},
     number = {6},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_241_6_a5/}
}